JP2000237687A - Crushed sand classifier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a crushed sand classifier easily adjustable so as to be capable of developing as high treatment capacity as possible corresponding to conditions of crushed matter without generating a trouble and lowering the classifying efficiency, for example, even if the water content of the crushed matter is high. SOLUTION: In the crushed sand classifier, a box-shaped body 1 equipped with a winnowing plate 2 having a large number of openings is vibrated by the vibration motor 4 provided to the box-shaped body 1 in order to crush a raw ore to take out the same as crushed sand with a predetermined particle size. By this constitution, the crushed matter supplied onto the winnowing plate 2 is winnowed by sending winnowing air to the box-shaped body to blow the same from the openings upwardly and the fine particulate matter contained in the crushed matter is winnowed to be separated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a sand crushing method for separating and removing fine particles in a classification process of crushing raw minerals to separate and remove sand crushing of a predetermined particle size for use in sand breaking for concrete and the like. It relates to a classifier.

[0002]

2. Description of the Related Art When crushing raw minerals to separate sand crushing into concrete sand crushing (crushed stone) and the like, sand breaking having a particle size specified by JIS is separated (for example, if the sand breaking type is A5004,
Among the operations of passing through a sieve having a size of 2.5 mm and staying with a sieve having a size of 1.2 mm, the operation of separating and removing fine particles which are relatively difficult to separate and remove is included. The fine particles generated by the crushing are transported in a powdery state together with the sand crushing, and are also transported in a state of being attached to the surface of the crushed relatively large crushing.
%, And if it is present together with the broken sand that has undergone the final treatment step without being subjected to the predetermined separation, for example, a problem occurs in the strength of the concrete, and since the water absorption is high due to the fine particles, the mud is increased. Existence as a state substance increases the water absorption rate, and again does not satisfy the requirements for sand breaking for concrete.

As one means for solving such a problem, conventionally, crushed materials supplied on a rotating disk-shaped separation plate called a separator are blown off by using centrifugal force to impart a wind separation effect. A device that separates the fine particles while the fine particles are used has been used. In addition, a cyclone-type separation device that sediments using a pressure difference has also been used. The introduction of this type of separator has made it possible to efficiently separate and remove fine particles from the crushed material and obtain sand breaking satisfying various purposes. There was an inconvenience to do.

[0004]

In each of the above-mentioned separation devices, fine particles adhere to the inner wall of a chamber for separating crushed materials (mixture of sand crushed and powdery materials having a predetermined particle size). If the crushed material is wet or the moisture content is high, the adhesion and deposition easily proceed, the classification efficiency is reduced, and the fine particles are easily clogged at the outlet.

[0005] In addition, when considering the efficiency of classification treatment, it is affected by the desired particle size of sand breakage, the generation rate of fine particles by the target mineral, and the water content (including conditions such as rain). However, it is difficult to easily perform adjustment for always ensuring the maximum processing efficiency by adapting to such conditions.

[0006] In view of the problems of the prior art, the present invention does not cause troubles in the apparatus and decrease the classification efficiency even if the pulverized crushed material has a high moisture content, and also as much as possible according to the conditions of the crushed material. An object of the present invention is to provide a sand breaking classifier that can be easily adjusted so as to exhibit high processing capacity.

[0007]

According to the present invention, in order to achieve the above-mentioned object, a sand breaking classifier is included in a crushed material crushed in a process of crushing a raw ore and removing it as sand with a predetermined particle size. A sand breaking classifier for separating and removing fine particles, wherein a box-shaped body 1 provided with a wind separation plate 2 having a large number of apertures 3 is vibrated by a vibration motor 4 provided in the box-shaped body 1. The crushed material supplied on the wind separation plate 2 is configured to be conveyed in one direction from a supply unit 5 to a take-out unit 6, and air for wind selection is sent to the box-shaped body 1 to open the hole. Air supply means 7 for blowing out fine particles contained in the crushed material by blowing upward from 3 is provided, and suction processing means 8 for sucking and removing the fine particles from the box-like body 1 is provided. , The means of taking.

In the present invention, a large number of apertures 3 of the wind separation plate 2 are formed by slits occupying 1 to 5% of the area ratio of the wind selection plate 2, and the slits are formed. However, it is preferable that they are formed so as to be longer in a direction orthogonal to the direction of transport of the crushed material, and are arranged so as to form a staggered shape in plan view.

Further, in the present invention, the vibration angle of the wind selection plate 2 by the vibration motor 4 can be adjusted within a range of 30 ° to 60 °, and the layer thickness of the crushed material on the wind selection plate 2 can be adjusted. It is preferable that it is comprised as follows.

Further, in the present invention, each of the large number of openings 3 of the wind selection plate 2 has a width of 0.2 to 0.6 mm and a length of 3 mm.
It is preferably formed to have a thickness of 0 to 100 mm.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, sand crushing refers to crushing of various quarried raw ores such as sand crushed concrete (crushed stone) and silica sand to obtain sand crushed of a required particle size. The type of ore is not specified. In addition, the crushed material means an unclassified state in which crushed sand of a predetermined particle size and a fine granular material are mixed, and the fine granular material is a material outside the range of the particle size that can be classified according to the purpose of classification. Of powder.

According to the present invention, when separating and removing the fine particles contained in the crushed material obtained by crushing the raw ore, the crushed material supplied on the wind separation plate 2 is taken out from the supply unit 5 and taken out from the supply unit 5.
During the one-way transport toward
The box-shaped body 1 provided with the wind-selecting plate 2 having the above is vibrated by the vibration motor 4 provided in the box-shaped body 1, and air for wind-selection is sent to the box-shaped body 1 by the air supply means 7. The crushed material blown upward from the opening 3 is supplied to the wind separation plate 2 to be filtered, and the fine particles contained therein can be suctioned and removed by the suction processing means 8.

At this time, since air is blown up from a large number of openings 3 of the wind separation plate 2 which exerts a conveying function, light fine particles are directly blown off and air is selected. Are constantly changing up and down, left and right, and the wind selection action can be efficiently performed on the fine particles contained therein, and the blown fine particles are simultaneously sucked by the suction processing means 8, so that rain Even if the humidity of the fine particles selected by the wind is very high or wet due to the influence of the above, it is attached and deposited by the moisture on the inner wall of the separation chamber as in the conventional air separator and cyclone method, and sorted. Separation and removal can be performed without inconvenience such as lowering the efficiency. Furthermore, since air is directly blown on the crushed material, it is expected that the water of the crushed material is blown away, and the action of automatically reducing or eliminating the wetness of the sand crush and the fine granular material can be expected. Improve.

In the present invention, the large number of apertures 3 of the wind separation plate 2 are constituted by slit-like bodies occupying 1 to 5% of the area ratio of the wind separation plate 2, and the slit-like bodies are formed. However, if it is formed to be long in the direction perpendicular to the direction of transport of the crushed material and is arranged so as to form a staggered shape in plan view, the air blowing pressure sufficient to blow up the light fine particles Can be easily obtained, and since the openings 3 are the staggered slits, it is possible to reliably perform the wind selection operation many times while the crushed material is transported. Combined with the change in the vertical and horizontal positions of the crushed material due to vibration, the efficiency of the wind selection operation is further enhanced.

Further, in the present invention, the vibration angle of the wind selection plate 2 by the vibration motor 4 can be adjusted within a range of 30 ° to 60 °, and the layer thickness of the crushed material on the wind selection plate 2 can be adjusted. In the case of such a configuration, the required transport speed and sufficient wind separation can be adjusted according to the type of crushed material (ore ore), classification particle size, and the humidity of the crushed material, and the optimal classification process It can be performed.

Further, in the present invention, each of the large number of apertures 3 of the wind separation plate 2 has a width of 0.2 to 0.6 mm and a length of 3 mm.
When it is formed in the range of 0 to 100 mm, the blowing speed from the slit is sufficient, and it can be surely blown off at a predetermined pressure. For example, instead of blowing a point as a line as a round hole and carrying out wind selection as a line, it is possible to wind select as a relatively large surface along with carrying from the beginning by blowing a line. At this time, if the size is the above, wind selection can be performed most efficiently in relation to the blowing pressure and speed.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a sand breaker classification device according to the present invention will be described below in detail with reference to the drawings. FIG. 1 is a front view of a sand blasting classifier that separates and removes fine particles contained in crushed crushed material in a processing step of crushing raw ore of concrete sand crushing and extracting it as sand crush with a predetermined particle size,
FIG. 2 shows a plan view thereof.

In this sand breaking classifier, a box-shaped body 1 provided with an air separation plate 2 shown in FIGS. 3 and 4 having a large number of openings 3 formed by slits is provided in the box-shaped body 1. Vibration motor 4
The crushed material supplied onto the wind selection plate 2 is conveyed in one direction from the supply unit 5 to the take-out unit 6. The box-shaped body 1 is mounted on a gantry 10 via an anti-vibration elastic member 9 so as to be able to vibrate (swing).

The vibration motor 4 is a well-known one. Here, the vibration motor 4 is provided on each of the right and left side walls of the box-shaped body 1 and is operated by an inverter to control the vibration angle of the wind selection plate 2. Can be adjusted in the range of 30 ° to 60 °, and the layer thickness of the crushed material on the wind separation plate 2 can be adjusted. As can be seen from the exploded view of FIG. 4, the box-shaped body 1 is composed of a lower box-shaped main body 1 a and an upper box-shaped hood 1 b with an air selection plate 2 interposed therebetween. Is connected to a supply hopper.

Then, air for air selection is sent to the box-shaped body 1 and blown out from the opening 3 to blow-up the fine particles contained in the crushed material as a turbofan as an air supply means 7. The vibrating box-shaped body 1
Duct 7 that can extend and contract with the duct opening of the box-shaped main body 1a
Connected by a. The box-shaped hood 1b of the box-shaped body 1
A bag filter type dust collector is provided as suction processing means 8 for sucking and removing fine particles from the air filter, and is configured to suction and filter the fine particles floating from the wind separation plate 2. The suction processing means 8 may be other than a bag filter type dust collector, and may be separated from those having a suction function and those having a filtration function.

As shown in FIG. 4, a large number of apertures 3 of the wind selection plate 2 are formed by slits occupying 1 to 5% of the area ratio of the wind selection plate 2. The slit-shaped body,
It is formed so as to be longer in the direction orthogonal to the direction of transport of the crushed material, and is arranged so as to form a staggered shape in plan view, so that the airflow blown out from the opening 3 can uniformly contact the crushed material. ing. In the drawing, reference numeral 2a denotes a portion located below the supply unit 5 and receiving the crushed material, and a plurality of small holes around the wind separation plate 2 are fixing bolt holes, and further, arrows Indicates the transport direction of the crushed material. In this embodiment, each of the large number of openings 3 of the wind selection plate 2 is
The slit width is 0.55 mm, the length is 40 mm, and the interval between the slits in the transport direction is 20 mm. The slit width is 0.2 to 0.7 mm wide and the length is 30 to 100 mm. If it works, it works well.

FIG. 5 is a graph showing the particle size distribution classified by the sand breaking classifier of the present invention.
The area between the graphs indicated by the marks indicates the range of the JIS standard, and the crushed material before classification is in the form of fine powder (-
Although the passing percentage of 0.075 to 0.15) is out of the JIS standard, as can be seen from the graph indicated by the mark, the fine powder is within the allowable range after classification. In this test, the crushed material has moisture, and the data is as shown in Table 1 below.

[0023]

For comparison, Table 2 shows the particle size range according to JIS A5004 for breaking sand for concrete. This is indicated by a graph line indicated by a triangle and a square in FIG.

[0025]

According to the present invention, when separating and removing fine particles contained in the crushed material of the raw ore, air is blown up from the large number of openings 3 of the wind separation plate 2 which has a transport function. In this way, light fine particulate matter is blown off directly, so that the mutual position of the crushed material constantly changes up and down, left and right by transport with vibration, and the wind sorting action on the fine particulate matter contained therein is efficient. It can be performed well, and furthermore, since the blown fine particles are simultaneously sucked by the suction processing means 8, even if the humidity of the fine particles selected by the wind due to the influence of rain or the like is very high or wet. In addition, there is a remarkable effect that the problem of the conventional apparatus can be solved and the separation processing can be performed without lowering the sorting efficiency. Furthermore, since air is directly blown on the crushed material, it is expected that the water of the crushed material is blown away, and the action of automatically reducing or eliminating the wetness of the sand crush and the fine granular material can be expected. There is an advantage to improve.

In the present invention, the large number of apertures 3 of the wind separation plate 2 are constituted by slit-like bodies occupying 1 to 5% of the area ratio of the wind separation plate 2, and the slit-like bodies are formed. However, if it is formed to be long in the direction perpendicular to the direction of transport of the crushed material and is arranged so as to form a staggered shape in plan view, sufficient air blowing pressure to blow up the light fine particulate matter Can be easily obtained, and since the openings 3 are the staggered slits, it is possible to reliably perform the wind selection operation many times while the crushed material is transported. Combined with the change in the vertical and horizontal positions of the crushed material due to vibration, the efficiency of the wind selection operation can be further enhanced.

In the present invention, the vibration angle of the wind separation plate 2 by the vibration motor 4 can be adjusted within a range of 30 ° to 60 °, and the layer thickness of the crushed material on the wind separation plate 2 can be adjusted. In the case of such a configuration, the required transport speed and sufficient wind separation can be adjusted according to the type of crushed material (ore ore), classification particle size, and the humidity of the crushed material, and the optimal classification process Has the advantage that it can be easily performed.

The other advantages of the present invention are as described in detail in the embodiments and examples of the present invention.

[Brief description of the drawings]

FIG. 1 is an overall front view of a sand breaking classifier according to the present invention.

FIG. 2 is an overall plan view of a sand breaking classification device according to the present invention.

FIG. 3 is a partially cutaway plan view of an air selection plate of the sand breaking classifier according to the present invention.

FIG. 4 is an exploded perspective view of a box-shaped body of the sand breaking device according to the present invention.

FIG. 5 is a graph showing a particle size distribution of broken sand by a broken sand classification device according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Box-shaped body 2 Wind selection board 3 Opening 4 Vibration motor 5 Supply part 6 Take-out part 7 Air supply means 8 Suction processing means

Claims (4)

[Claims] 1. A sand breaking classifier for separating and removing fine particles contained in a crushed crushed material in a processing step of crushing a raw ore as sand crushed with a predetermined particle size. The box-shaped body 1 provided with the wind separation plate 2 is vibrated by a vibration motor 4 provided in the box-shaped body 1, and the crushed material supplied on the wind separation plate 2 is taken out from a supply unit 5 to a removal unit 6. To send the air for wind selection to the box-shaped body 1, blow out upward from the opening 3, and wind-separate and separate the fine particles contained in the crushed material. A sand breaking classifier, comprising an air supply means 7 and a suction processing means 8 for sucking and removing fine particles from the box-shaped body 1. 2. A large number of apertures 3 of said wind selection plate 2 are formed by slits occupying 1 to 5% of the area ratio of said wind selection plate 2, and said slits are: The sand classification device according to claim 1, wherein the sand classification device is formed so as to be longer in a direction orthogonal to the direction in which the crushed material is conveyed, and is arranged so as to form a staggered shape in plan view. 3. A vibration angle of the wind selection plate 2 by the vibration motor 4 can be adjusted within a range of 30 ° to 60 °.
The sand classification apparatus according to claim 1 or 2, wherein the layer thickness of the crushed material on the surface is adjustable. 4. Each of the large number of apertures 3 of the wind selection plate 2 has a diameter of 0.1 mm.
4. The sand breaking classifier according to claim 1, which is formed to have a width of 2 to 0.6 mm and a length of 30 to 100 mm.